Water-tube boiler.



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WATER TUBE 80ILER.

APPLICATION FILED AFR.17. 1916.

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I i LLLL'I I Z -C.-W. DYSON. WATER TUBE BOILER. APPLICATION FILED APR.II. 1916.

Patented {Sept 17,1918.

' 3 SHIFETSHEET 2.

A TTORNE YS:

C. W. DYSON.

WATER TUBE BOILER.

APPLICATION FILED APR. HD1916.

Patented Sepfi. 17, 1918'.

INVENTOR.

/ ATTORNEYS.

CEAELES W..IDYSON, 0F WASHINGTGN, DISTRICT 01? COLUMBIA.

WATER-TUBE BOILER.

Specification of Letters Patent. l?atented Sept. l'gfl i s I Applicationfiled April 17, 1916. Serial No. 91,721.

To all whom it may concern:

, Be. it known that 1, CHARLES W. Dyson, a citizen of the United States,residing at Washington, in the'District of Columbia,

have invented certain new and useful Imp'rovements in. -tilater-TubeBoilers, of which the following is a specification.

My invention relates to water tube boilers and more particularly to oneadapted for marine work, and will be understood from 3 a top view withcertain of the parts removed and others broken away. Similarreferencenumerals indicate similar parts in the several views.

Referring to the drawings the numeral 1 indicates the front wall, and 2the rearwall, of the setting. The boiler is shown with a furnace adaptedfor oil fuel, the openings in the furnace front for the burnersor'atomizers being indicated at 3 in Fig.

3; The furnace is shown as increasing in height from the front to therear in a curve approximating that of the natural path of travel of thegases, thus giving thegases ample space in which to mix thoroughly andto burn before entering the tubes forming the heating surface. By thisarrangement an ellicient combustion and a high furnace temperature issecured.

The tubes forming the heating surface are divided into verticalsections, each section bein made up of a series of tubes 4 expan ed attheir ends into corrugated wrought steel headers 5 and 6, the tubesbeing so disposed that laning of the gases is prevented. The frontheaders 5 are inclined slightly "from the front wall 1, and the rearheaders 6 are disposed in a substantially;

horizontal plane near the roof of the setting and substantially in theplane of the water level of the steam and water drum 7; By reason ofthis disposition of the headers, the tubes 4 extend in a straight linefrom the front headers 5 to substantially the midlength of the tubes,and are then bent on arcs having a substantially common center so as toenter the rear headers 6 at substantially a right-angle. The headers 5and 6 thus lie in intersecting planes and the tubes are so bentthattheir ends are substantially normal to the plhnes of the two I sets ofheaders, As indicated in Fig. 3, each corrugation 'or bend of theheaders receives a group of four tubes, these tubes in ractice beingsubstantially two inchesin iameter. pposite each group of tubes is theusual hand-hole fittin "8.

Extending across t e front of the boiler,

in the space above the tubes is a horizontal steam and water drum 7. Theupper end of each of the front headers 5 is connected to said drum bytubes 9, and the front end of each of the horizontal or rear headers 6is connected to said drum by horizontal tubes 10. Each section is,therefore, pr0- vided with an independent inlet and outlet for water andsteam.

Placed across the bottom of the front headers, and connected thereto bynipples, is a box 11 which forms a blow-ofi connection through which theboiler may be completely drained. This box is connected by groups oftubes 12 with the rear headers, and they support a roof baiile 13extending from the cross-box 11 to the rear transverse ballle 14. Thebank or" water tubes is divided by the bailles l4 and let into threetransverse passes. A ballle 14 extends from baille 14 to the rearheaders (3 to direct the gases to the stack outlet. Access for cleaningany dust or soot which may collect upon the baffle 13, in the spacebetween said baffle and the lower part of the bank of tubes 4:, may behad through the door 15.

The circulation of the water'is through the nipple 9 shown in Fig. 1 andalso through the downcomers 16 shown in Fig. 2. The downcomers 16 showninFig. 2' conduct Water directly from the, steam and water drum -7 tothe cross box 11, from which it is distributed through the front headers5, thus supplementing the waterwhichreaches the lower tubes of theboiler through the nipples 9 shown in Fig. l. The course of the gases issubstantially that indicated by the arrows, namely, to the uptake endsof the tubes, downward th rough the second pass and upward through thethird pass,

thence through the 'spaces between the tubes or nipples ldto the stackoutlet 17 between the inner ends of the rear headers and the steam andwater drum. The outlet is controlled by dampers 18.

Hinged to the framing at the front, are large doors 19 giving access tothe handhole plates covering the tube ends Doors :20 give access to thehand-hole coverings of the rear headers 6,

Elie advantages of my invention, which is especially adapted for marinework, flow from the decreased floor space for a given horsepower,thelarge furnace volume and the longer travel of the gases before theyenter the Water heating surface.

Any type of combustible may the furnace.

While I prefer the individual header construction shown and described,my invention contemplates the use of water legs of the usualstayed-surface type in place of the headers.

It will be seen that the hot gases are first made to pass transverselyover the uppen nrost ends of the tubes, at which point the tubes areinclined at the maximum angle to the horizontal, the upper part of eachtube eing, in fact, in a substantially vertical-position. This leads toa decided advantage in inducing a maximum flow of water and steamthrough the tubes.- Furthermore, the hand-hole fittings 8 of the rearheaders and the expanded joints of the rear ends of the water tubes,which approximately be used in amounts to of such joints in the boiler,

all

are above or approximately at the water level. The advantage of this isthat it is not necessary to'empty the boiler to renew or tighten any ofthese joints.

What I claim and desire to secure by Letters Patent of the United Statesis l. A Water tube boiler having a bank of generating of their lengthwith their lower ends lying in a vertically extending plane and theirupper ends lying in a horizontally extending plane, horizontallyextending rear headers to which the upper ends of the generating tubesare connected, front headers to which the lower ends of the tubes areconnected a cross'box connected to the lower ends of the front headers,water tubes con necting said box with the rear headers, a transversesteam and water drum above the lower ends of the tubes, substantiallyhorizontal nipples connecting the inner ends of the rear headers to thesteam and water drum, a stack flue leadin upwardly from the spacebetween rear hea ers and the steam tubes curved for at least a part andwater drum, and bal'flcsto direct the flow of the gases over the tubes.and through the nipples to the outlet.

2. A water tube boiler having a bank of generating tubes curved for atleast a part cross box connected to the lowerends ofthe front headers,water tubes connecting said box with the rear headers, a battleextending from said box and supported on said water tubes, a transversesteam and water drum above the lower ends of the tubes, substantiallyhorizontal nipples connecting the inner ends of the rear headers to thesteam and water drum, a stack flue leading upwardly from the spacebetween the rear headers and the steam' and water drum, and bafiles tod1- rect the flow of the gases over the tubes and through the nipples-tothe outlet.

3. A water tube boiler having tubes inclined upwardlv from the front tothe rear, headers to which said tubes are connected, the rear headersbeing set in a substantially horizontal plane, a transverse steam andwater drum located at the front of the boiler in the space above saidtubes, substantially horizontal nipples connecting the inner ends of therear headers and the steam and water drum, nipples connecting the upperends of the front headers with the steam and water drum, a crossbox-connected to thelower ends of the front headers, water tubesconn'ectinn: saidbox with the rear headers and spaced apart from themain bank of tubes, and down-comers from the steam and Water drum to,said cross box.

In testimony whereof I have hereunto signed my name in the presence oftwo subscribing witnesses.

, CHARLES w. DYsou.

Witnesses T. E. JoHNs'roN, H. J. HAsBRoUoK.

